There is 2 ways you can play it by having the manual or just write something wrong when it ask you a question and then you get to dos then you simply write "crack.exe
" and the game boots up again and now just enter some random number and it works fine.
The other way is to go use the manual on "http://tinkerbrain.com/stunt_island/stuntisle.pdf"
here you can find the airplanes and find the info about it, but they should just make so the game start from "crack.exe
" instead then it will work fine!